Given that today is the Feast of St. Ambrose of Milan (Saint of the Week here), a man whose hymnody we have discussed in the past, here is a Christmassy/Advently hymn for your enjoyment. The translation is mine, based on the text of Early Latin Hymns (ed. A. S. Walpole for Cambridge Patristic Texts, 1922: pp. 35-39).
It is known by first line as ‘Splendor Paternae Gloriae’:
Splendour of the Father’s glory,
bringing forth light from light,
light of light and source of brightness,
the brightening day of days,
and true Sun slide in,
gleaming with eternal brilliance,
and radiance of the Holy Spirit
pour into our senses.
With prayers let us also call the Father—
the Father of eternal glory,
the Father of mighty grace—
that he may remove the deceitful blame,
that he may shape our actions of vigour,
dullen the teeth of the grudging one,
favourably guide harsh occurrences,
bestow the grace of carrying things through,
guide the mind and rule it
with a chaste, faithful body;
may faith be inflamed with heat,
may it not know the poisons of fraud.
And may Christ be food for us,
and may faith be our drink;
happy, may we drink the sober
inebriation of the Spirit.
May this happy day come to pass,
may modesty exist as the dawn,
faith like the noonday,
and may the mind not know the dusk.
Dawn pulls the chariot,
may the complete dawn come,
the Son complete in the Father,
and the Father complete in the Word.